The magnetic properties of lanthanide and actinide pnictides and chalcogenides have been compiled in subvolume 27B. While subvolumes 27B1, 27B2, 27B3, 27B4 and 27B5 (already published) deal with lanthanide pnictides and lanthanide chalcogenides of different type,. the properties of actinide pnictides and chalcogenides are covered in subvolumes 27B6, 27B7 and 27B8. The present subvolume 27B8 deals with ternary actinide pnictides and chalcogenides.- Ternary actinide pnictides and chalcogenides form a large family of phases which exhibit a great variety of different stoichiometries, crystal structures and non-trivial physical properties. Their magnetism is complex due to similar order of magnitude of Coulomb, spin orbit, crystal field and exchange energies.